I recognise that a lot of people have had similar problems to me however i've read the responses and they don't directly address my specific problem, so here goes.. On my Mac Pro (X1900) I have the option to rotate my display (Dell 2005FPW) so I can have it in portrait mode, this is highly useful for the purposes I need to use it for. On my older PowerMac G5 however (NV5200) I don't have this ability and I get an error message when I use spotlight to try and locate the missing tab: Obviously I know this to be false as I've used the display on Windows computers and my Mac Pro in portrait mode frequently and it's worked fine. From other threads I've established that display rotation features are not unique to ATi cards as my experience would suggest and people with even old iBooks have had the option to rotate their external display. A common solution has appeared to be holding down the option (alt) key when clicking on the display pane of system preferences. Alas for me this has had no joy. I'm using 10.5.2 on both Mac Pro and Power Mac G5 so there shouldn't be any difference there. Any ideas guys?